JPS63199037A - Work feeding device - Google Patents

Abstract

PURPOSE:To feed a work by correctly rotating it by composing an upper clamp means of the bearing block supported on a holder and an upper part clamp plate, connecting the upper clamp plate to the bearing block and a universal and fitting an elastic body into a connection part. CONSTITUTION:A freely rotatable bearing block 104 is supported via a radial bearing 102 and thrust bearing 103 inside the recessed place 101 of the holder 28 vertically driven for a carriage. The member 105 projecting to the lower part is screwed into the before and behind both ends of the bearing block and connected to a universal by the member 106 screwed to the upper part of an upper clamp plate 26U in the shape of intersecting at right angles therewith and by a crossbar 107. A gun metal bush 109 is fitted between the members 105, 106 and each bar 108 of the crossbar 107 inserted inside. A rubber bush 111 is respectively fitted between the members 106, 105 and the center connection part 110 of the crossbar 107. With this feeding device, a work can be fed to a working machine by correctly rotating it without damaging it.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a workpiece that feeds a plate into a plate processing machine such as a plate bending machine or a jarring machine, and rotates the plate to change the side. Regarding the feeding device.

[Conventional technology]

For example, as a device for feeding work plate materials into a bending machine,
A device as disclosed in Japanese Patent Laid-Open No. 58-168445 is known.

That is, a pair of upper and lower workpiece clamping means are provided at the tip of a roughly C-shaped carriage that can be freely moved back and forth, and the workpiece clamped by the workpiece clamping means is fed into and pulled out of the machine tool by the back and forth movement of the carriage, and the pulled out workpiece is This is a device in which the other side of the workpiece is rotated by the rotational drive of the workpiece clamping means to face the machine tool.

However, in the above-mentioned type of device, the carriage must be rotated by a predetermined angle (usually 90 degrees or 180 degrees) while holding the work plate material between them, so the carriage is formed in a so-called C-shape with a deep neck. , the following problems occur.

[Problem that the invention seeks to solve]

In other words, when a plate material is strongly clamped between the work clamping means above and below the front end of the carriage, the front end of the carriage tends to open vertically (Fig. 7), and the clamping means (Cr
) acts strongly locally on the plate material, causing scratches on the plate material (W) surface, and the clamping surface of the clamping means does not come into even pressure contact with the plate surface, causing the rotation of the clamping means itself to be affected when the plate material is rotated. However, problems have arisen in that the plate material slips and rotation of the plate material through a predetermined angle cannot be achieved.

In addition, if the clamping pressure of the clamping means is increased in an attempt to solve the latter problem, that is, the inability to rotate the plate at a predetermined angle, the degree of damage to the plate increases accordingly. If the rotation angle of the clamping means itself is set in advance to be large, rotation control becomes complicated and it is not a fundamental solution in terms of preventing damage to the plate material.

[Means for solving problems]

The workpiece feeding device that solves the above problems is one in which the upper clamp plate of the upper and lower pair of clamp plates of the carriage and the support block supported by the holder at the front end of the carriage are universally connected, and the carriage is opened. The inclination of the workpiece clamping surface due to the action is absorbed by the universal connection between the upper clamp plate and the support block, and the plate is always clamped evenly and tightly by the upper and lower workpiece clamping means. The fitted elastic body allows the upper clamp plate to slide in two orthogonal directions, so it can be accommodated even if there is some misalignment of the rotation axis between the upper and lower clamping means, thus preventing the workpiece from slipping when rotating. and make it possible to obtain a predetermined angle of the workpiece.

〔Example〕

Hereinafter, an embodiment applied to a workpiece feeding device for folding and transporting will be described based on the drawings.

The workpiece feeding device (1) of this embodiment is a workpiece (W) to be carried in.
) is placed on the front table (2), and this table (2)
) A width determining mechanism (3) that positions the workpiece (W) in the width direction on The carriage (5) is C-shaped in side view, and the sub-carriage (6) provides movement to the unclamped workpiece (W). ) is installed perpendicular to the transport line.

Note that the bending machine (50) in this embodiment includes a ram (53
) and a folding machine (51) that moves up and down.
A blank holder consisting of a lower mold (52) fixed to a frame (54) constituting the main body of the heat insulation material workpiece (also referred to as a blank) held by the holder (
A rocker arm (56
) and drive actuators (57), (5B), (59) that swing or horizontally move the arm (56).
It consists of One of the molds of the blank holder, usually the upper mold (51), is movable up and down to allow the workpiece (W) to enter and exit, and is configured as a split mold that can change the width of the mold to accommodate the width of the workpiece. .

As shown in FIG. 3, the above-mentioned front table (2) has a plurality of passages ( 7)
It is an assembly of strip-shaped tables forming a passageway (8) for passing a carriage (5) in a workpiece feeding direction (direction of arrow B in the figure) perpendicular to the workpiece feeding direction A. Below the front table (2), magnetic conveyors (9) for loading and unloading workpieces (W) are provided on the left and right sides of the carriage path (8). The magnetic conveyor (9) replaces the belt of the belt conveyor with a rubber belt containing a magnet or an absorbent belt equipped with a magnet, and it attracts the workpiece (W) and attaches it to the front table (2) from any direction. It is carried in to approximately the center of the table (2), and then carried out to the outside of the table (2). The movement of this conveyor (9) is at a constant speed, and a certain point is moved to the workpiece (
After confirming with the limit switch (10) or other sensor that W> has passed, the conveyor (9) is stopped after an appropriate period of time based on the input data regarding each work, and the work (W) is placed in the center of the table (2). ) is preferably provided so as to be stopped, but of course manual stopping by visual recognition by the operator is also possible.

The workpiece (W
As shown in FIG.
A claw member (11) that moves in the workpiece transport direction A in the passage (7) of 2), and a claw member (11) that supports the claw member (11) and moves mutually in the workpiece transport direction A around the carriage passageway (8) in the center of the table. It consists of a sending mechanism (12) that moves the robot closer by the same amount.

Here, the feed mechanism (12) includes a slide table (13) on which the claw member (11) is placed, a threaded rod (14) with reverse threads of the same pitch on the left and right sides, and the screw a nuff (15) that connects the rod (14) and the slide table (13); a drive motor (16) that drives the threaded rod (14); and a guide rod that supports the slide table (13). (17), which gives the same amount of feed to the claw member (11) on the slide table (13) in the opposite direction centering on the carriage path (8). In addition, the above-mentioned N
It is preferable to use a ball screw suitable for C control, etc.

The claw member (11) is provided on the sliding table (13) so as to be swingable in the workpiece conveyance direction A with a pivot (18). Each of the claw members (11) is rotatable inward, that is, toward the carriage path (8), and the outer surface (lla) of the portion protruding above the front table (2) is an inclined surface.
Normally, this claw member is provided so that even if the workpiece (W) is carried in from either direction, it will tilt inward and sink below the front table (2), and the workpiece (W) will pass over it. (11) is the weight part (
llb) protrudes above the front table (2) and functions as a stopper that can rotate outward, so if there is a workpiece (W> in between, it can be held between the workpieces and the table). It can be aligned to the center.

In addition, the above-mentioned sliding table (13) and NAND (15) are connected via a spring (19), and the claw member (11)
When a resistance of more than a certain value occurs in the spring (19)
is compressed to substantially stop the swinging of the claw member (11) and prevent deformation of the workpiece (W). Thereby, the width determining mechanism (3) allows the ball screw rod (14
), but in reality, the claw member (11
) is about to be narrowed, this can be escaped by compression of the spring (19). In this case, Natsuto (
15) is detected by the limit switch (20) and is avoided by immediately stopping the drive motor (16).

The origin finding mechanism (4) arbitrarily protrudes onto the feeding surface of the workpiece (W), that is, the front table (2), contacts the front edge of the workpiece (W) at at least two points, and aligns the feeding start position of the workpiece. In this embodiment, the origin pins (21) are arranged evenly in the direction orthogonal to the feed direction with the carriage path (8) as the center, and the origin pins (21) are selected as appropriate in accordance with the width dimension of the workpiece (W) to be fed. It is placed so that it stands out. In this embodiment, the cylinder actuator (22) is used to move the origin search bin (21) in and out.
This is done individually by In addition, the origin setting pin (21) of this embodiment can electrically detect whether or not the workpiece (W) is in contact with both pins (21) by applying current between the left and right origin setting pins (21). In this way, the stopper that receives and stops the workpiece (W) also functions as a sensor that detects the presence of the workpiece (W), but a separate sensor is provided to detect the presence of the workpiece (W). Alternatively, two movable pins (21) may be provided, and these may be moved by the same amount left and right in response to changes in the width of the workpiece.

The carrier (5) includes clamping means (2) that can hold the workpiece (W) and rotate it by a predetermined angle in a horizontal plane.
3) is installed at the tip and moves across the front table (2) to give a predetermined feed to the clamped workpiece (W). This carriage (5) is on the guide rail (not shown) of the bed (24)! ! the feed screw (
25) so as to be movable in the workpiece feeding direction B. As the feed screw (25), a ball screw suitable for an NC servo mechanism or the like is normally used, and provides a predetermined amount of feed to the workpiece (W) by moving the entire carriage (5). The rotation of the feed screw (25) is controlled by a drive motor, for example a DC control motor (46).

The clamping means (23) includes a pair of rotatable clamp plates (2611) and (26) that clamp the workpiece (W) from above and below.
D), while usually the upper clamping plate (2
6υ) is movable up and down with respect to the carriage (5), and is provided so that a workpiece (W) carried onto the front table (2) can be held at will. The upper clamp plate (hereinafter referred to as "upper clamp plate") (2611) is rotatably attached to the holder (28) which can move up and down along the guide rail (27) at the front end of the carriage (5) by a mechanism detailed later. The holder (28) supporting the upper clamp plate (260) is raised and lowered by driving a built-in cylindrical actuator or rotating a ball screw. ') (260) is rotatably supported by a bracket (29) fixed to the front end of the carriage (5), and a rotational drive mechanism and an indexing mechanism are connected to the rotating shaft (30). It is provided so that it can be rotated and stopped at a desired angle.

The rotation driving means applies a predetermined rotation 11 (for example, 90 degrees, 180 degrees) in order to change the direction of the workpiece (W) with respect to the lower clamp plate (26D), and in the case of this embodiment, the rack ( 31) and pinion gear (32) to convert the linear motion of the cylinder type actuator (not shown) into rotation of the shaft (33) in the carriage, which is then transmitted to the lower clamp plate via a pair of bevel gears (34). (26
D). Clamping means (23)
Since the rotation to be applied may be in any direction, rotation within 180 degrees is sufficient. For this reason, it is preferable to employ a cylinder-type actuator that has at least a stroke sufficient to rotate the rotating shaft (30) by 180 degrees or 90 degrees.

Moreover, the indexing mechanism is for reliably stopping the rotation of the clamping means (23) at a predetermined angle, and the indexing disk (
35) and an indexing pin (37) which engages with a notch (36) on the periphery of this disk (35), and which is optionally protruded by a cylindrical actuator (38). The stopping position of the indexing disk (35) and thus of the lower clamping plate (26D) can be determined.

Next, the structure of attaching the upper clamp plate (260) to the holder (28) will be explained in detail.

That is, as shown in the first figure, a recess (
A rotatable support block (104) is supported within the support block (101) via a radial bearing (102) and a thrust bearing (103), and downwardly projecting members (105) are provided at both the front and rear ends of the support block (104). )
a member (106) attached to the upper part of the upper clamp plate (2611) with a screw (113) in a manner perpendicular to the member (105), or a cross bar (107). Universally connected (as shown in Figure 1.5), the crossbar (107) is swingably attached to the member (105), and the crossbar (107) is orthogonal to the member (105). Since the member (106) is attached so as to be able to swing freely in the direction of rotation, the upper clamp plate (26U) can always be evenly pressed against the workpiece (W).

Moreover, the member (105) (106) and the member (105)
Each one of the crossbars (107) inserted in (106)
(10s), a gunmetal bushing (109) is fitted to allow the upper clamp plate (26tl) to swing smoothly.

On the other hand, each of the above members (105) (106) and the crossbar
Rubber bushings (111) are fitted between the central connecting portions (110) of the (107). In other words, the rubber bush (111) allows the member (105) to be moved even if the center of the two rotational axes is slightly misaligned due to the opening action of the carriage between the upper and lower clamp plates (260) (260) when the workpiece (w) is being clamped. The crossbar (10
7) in the direction of the arrow in FIG. 5, and the crossbar (107)
Since the member (106) attached to the upper clamp plate (
260) While rotating itself (in the direction of arrow F in FIG. 6), it also rotates around the center (C) of the lower clamp +ff1 (260) (in the direction of arrow G in FIG. 6).

Note that (C') is the center of the upper clamp plate (26U). Therefore, there is an advantage that the workpiece (W) does not slip with respect to the rotation of the clamping means (23) itself when the workpiece is rotated, and therefore the workpiece (W) can be accurately rotated by a predetermined angle. Note that (113) is a ball bearing.

The carriage (5) also has a sub-carriage (6).
is equipped with. This sub-carrier (6) moves in the same direction as the carriage (5), that is, in the feed direction, to give movement to the workpiece (W) when it is not clamped, and is driven by its own feed mechanism. This supuchare 7ji (6) has a block (39) at the tip that comes into contact with the workpiece (W).
) is an electromagnetic chuck, and the workpiece (
W) is provided so that it can be drawn out by suction. The block (39) is attached to the bracket (41) on the base (40).
It is attached to the tip of the sliding rod (42) supported by the workpiece (W), and is provided so that it comes into contact with the rear edge of the workpiece (W) and moves backward when receiving pressure from the workpiece (W). . And this block (39) and bracket (41)
) A compression coil spring (43) is interposed between the block (39) and the block (39), which is always urged forward and moves backward only when it receives a reaction force on the workpiece side that resists the spring force of the spring (43). It is set up to do so. This block (3
9) is effective in preventing deformation of the workpiece (W), but becomes more difficult as the spring (43) becomes more compressed. Therefore, the movement of the rod (42) is detected and the drive motor (
44) is provided with a limit switch (45) for stopping the operation.

When using the workpiece feeding device configured as described above, the workpiece is accurately fed without being damaged, and the workpiece is rotated so that the bending operation can be performed accurately and with high precision.

That is, when the workpiece (W>) is carried onto the front table (2), the limit switch (10) confirms that the workpiece has passed a predetermined position, and the workpiece is stopped at approximately the center of the table (2).At this time, The carriage (5) is pre-arranged based on input data regarding the carried-in workpiece (W) so that the clamping means (23) is positioned approximately at the center of the workpiece (W).

Therefore, the width determining mechanism (3) located outside the workpiece (W)
The claw members (11) are moved inward to determine the width of the workpiece (W), that is, to align it in the direction orthogonal to the workpiece feeding direction B.

Next, the workpiece (W) is rotated or not rotated as necessary to find the origin.

Normally, the workpiece (W) is transported in the longitudinal direction and bent from the longitudinal edge, that is, from the short side, so the workpiece (W) is rotated 90 degrees and processing begins. In addition, when the workpiece (W) is rotated when setting the origin, at least the width is determined again, and then the workpiece (W) is sent to the originating pin (21) using the sub-caliber (6). The front edge of the workpiece is pressed against at least two origin setting pins (21) to align the feeding start position of the workpiece (W).

The so-called origin search is performed.

During the above 90 degree rotation, even if the workpiece (W) is strongly clamped by lowering the upper clamp plate (26υ) and the carriage (5) is slightly opened as shown in Figure 5, the upper clamp Since the plate (2611) swings as described above, the workpiece (W) is attached to the upper and lower clamp plates (26υ).
(26D) is held evenly by the entire surface, and rotation is given exactly as desired.

Since the width of the workpiece (W) has already been determined when finding the origin, the positioning has been completed in both the feed direction and the width direction, and the bending machine (50 ) can accurately position the workpiece within the mold. Therefore, the clamping means (
23) Close and clamp the workpiece (W). and,
Feed the workpiece (W) by a predetermined amount based on the data entered in advance. If the width of the workpiece (W) is narrow or the length is short and the center of the workpiece cannot be clamped, for example, clamping the center of the workpiece may cause the workpiece to bend. machine (50
) upper mold (51) and holder (28) for clamp (23)
If there is interference between the workpiece (W) and the workpiece (W), the rear part of the workpiece (W) is held and sent.

The workpiece (W) is bent by bending m (50) of the upper die (
51) is lowered to fix the workpiece (W), and the blade (
55) at the tip thereof.

After the bending process, the upper die (51) is inched upward to release the workpiece (W) from the restrained state.

After that, when performing the so-called secondary bending process in which the tip edge of the bent workpiece is further bent in the opposite direction or humming bent, the workpiece is pushed out a predetermined amount again and the above-mentioned operation (fixing the workpiece → bending process) is repeated. If the secondary bending process is not performed, the workpiece (W) is unclamped and the sub-carriage (6) is driven to push the workpiece (W) forward and connect it to the gooseneck bending upper mold (51). Interference is prevented, and the upper mold (51) is raised to perform mold cutting.

Next, the workpiece (W) is pulled out backwards while being sucked by the subcarrier (6).

The entire carriage (5) is also moved back and the workpiece (W) is pulled out to a position where it can be rotated, and if all bending is completed, the magnetic throat conveyor ( 9). On the other hand, if the other side is to be bent subsequently, the workpiece (W) is clamped again and rotated by a predetermined angle, the width is determined again, the origin is determined, and the workpiece (W) is fed by a predetermined amount to the bending a (50).

〔Effect of the invention〕

As is clear from the above explanation, if the workpiece feeder according to the present invention is used, even if a plate workpiece has a large area, is heavy, and is likely to shift during rotation, it can be moved to the desired position without damaging the surface. It can be rotated accurately to the specified rotation angle and supplied to processing machines such as bending machines.

Therefore, the processing accuracy of the plate processing machine tool can be improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional side view of the clamping means portion of the workpiece feeding device according to the present invention, Fig. 2 is an overall side view of the workpiece feeding device in combination with a plate bending machine, and Fig. 3 is the same workpiece. A plan view of the feeding device, Fig. 4 is an explanatory diagram of the width determining mechanism, Fig. 5 is a cross-sectional plan view taken along the line V-V in Fig. 1, and Fig. 6 is a diagram when a misalignment occurs between the upper and lower clamp plates. FIG. 7, which shows the center of the upper and lower clamp plates, is an explanatory diagram showing a conventional workpiece feeding device. (1) --- Workpiece feeding device (5) --- Carriage (26U) --- Upper clamp cross (260) --- Lower clamp plate (28) --- Holder (30) --- Rotating shaft (104)...Support block (111)-...Rubber bush (W)...Work

Claims (1)

[Claims] A pair of upper and lower workpiece clamping means is provided at the tip of a substantially C-shaped carriage, and a rotational drive source is connected to the workpiece clamping means, and the workpiece clamped by the workpiece clamping means is sent by movement of the carriage, and the workpiece clamping means is rotationally driven. The workpiece feeding device rotates the workpiece by a pair of workpiece clamping means, in which the upper clamping means comprises a support block supported by a holder at the front end of the carriage and an upper clamping plate, and the upper clamping plate is supported by the holder. A workpiece feeding device characterized in that it is universally connected to a supporting block, and an elastic body is fitted into the connecting portion.